Arc-lamp.



No. 844,439. PATENTED FEB. 19, 1907. J. H, BENNETT 41A 1" MINER.

ARC LAMP. APPLICATION FILED JUNE 3,1905.,

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. YATENTED FEB. 19, 190?. J. H. BENNETT 6; A. 1. MINER.

ARC LAMP.

APPLIOATIGH FILED mm 3 1905.

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3 QVVZOM John H.B:;1 ne# Adrian [Miner W 9 seription of UNITED sma ls HATENT oFFIoE.

SA N FRANCISCO,

CALIFORNIA.

ARC-LAMP.

Specification of Letters Patent.

Patented Feb. 19, 1907.

Application filed June 8,1905. Serial No. 263,565

To all whom it may concern.-

Be it known that we, JOHN H. BENNET'I and ADRIAN I. MINER, citizens of the United States, and residents of the city and county of San Francisco, State of California, have invented certain new and useful improvements in Arc-Lamps; and we do declare the following to be a full, clear, and exact d.e the same, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings. and the characters of reference marked thereon, which form a part'of this specification.

Our invention relates electric-arc lamps; and our object is to produce a simple, effective, automatic carbonfeed for said lamps and also to generally improve upon the style and arrangement of the amps as now used. This object we accomplish by the peculiar construction and relative arrangement of parts hereinafter fully described and particularly pointed out in the claims appended.

In the drawings similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a vertical section of our im proved lamp. Fig. 2 is a sectional view taken on a line a: at of Fig. 1. Fig. 3 is a sectional view taken on a line y y of Fig. 2. Fig. at is a perspective view of our improved car hon-clutch. Fig. 5 is a top view of the carbon-clutch shown in Fig. 4.

1 designates the frame of the lamp, and 2 the globe. Said frame 1 is provided with a removable bottom 1. secured in position by means of screws 1*. 3 is a casing arranged. at the top of the said frame 1 and provided with a base 4 and a screw-cap 5 and wire connections 6.

7 is a brass tube arranged within the casing 3 and extending a short ways below the base 4, said tube being provided with a centrally oriticed top cap 8 and a similar centrallyoriliccd bottom screw-cap 9. Within the said tube 7 is arranged a carbon-clutch comprising a female member composed of a curved iron bar 10, provided with slightlyovaled rings 11, and a male member composed of a curved iron bar 12, provided with slightly-ovaled rings 13, adapted to {it between the rings 11. The upper carbon 14 fits through the orifices in the caps 8 and 9 to improvements in i and the rings 11 and .13 and is f a cap 15, to which is connecte wire 16.

Surounding the tube 7 and resting on the base 4 is a coil 17, suitably connected to the wire 18, carrying the current to the bottom carbon. Between the said coil and the said tube, on opposite sides thereof, are two narrow strips of soft iron 19, for the purpose as will be shown.

In the lower end of the casing 1 is secured a conductive tube 20, open at both ends and threaded at the lower end to receive a nut 21 and a cap 22, the wire 18 being connected to said tube between said nut and said cap. To insert the lower carbon, the cap 22 is removed and the carbon inserted upward into the tube 20 and secured therein by means of a small set-screw 24. The cap 22 is then screwed on, which excludes the air as is necessary. This construction is particularly advantageous, in many forms of the old style lamps the carbon is inserted through the top of the globe, and thus very often the globes are broken.

To clean the lamp, the bottom may be removed by loosening the screws 1 r The operation of our improved carbon-feed provided with r the current- I l l l is as follows: \Vhen the current is turned on, assuming the parts to be in the )osition shown in Fig. 3, the members 10 an 12 will be repelled and caused to grip the carbon, due to these members being magnetized, while the members 19 will also be magnetized, the members 10 and 12 gripping the carbon and holding the same stationary. As the l carbon burns out the resistance increases, thus allowing the clutch to slightly release and permit the carbon to feed down to the required point. The clutch automatically adjusts itself to varying amperage-for inr stance, if the lamp is wound to a certain voltage and amperage and that amount is I suddenly increased after lighting the lamp, I the clutch will enlarge the arc, thus throwing l in resistance, which will prevent the lamp 'from being burnt out. The iron strips 19 concentrating the magnetism in the opposite sides of the tube 7 keeps the clutch well centercd. and thus holds the carbon steady and 1 true this result being due to the fact that f the force is exerted equally at substantially opposite points of the tube.

e have now entered into a detailed description of the construction and relative arrangement of parts embraced in the present and preferred embodiment of our invention. We do not desire, however, to be understood as confining ourselves to such specific detail, as such changes and modifications may' be made in practice as fairly fall within the scope of our claims.

I [aving thus described our invention, what we claim as new and useful, and desire to secure by Letters Patent, is

1. In an arc-lamp a brass tube provided with top and bottom centrall orifiecd caps, a two-part carbon-clutch of magnetic material arranged within said tube, a current-carrying coil surroui'lding said tube, two small strips of soft iron between said coil and said tube one opposite the other, a carbon dis posed between the two parts of said clutch, as specified.

2. In an arc-lamp a seat for the bottom carbon coin weed of a conductive tube open at both enc s and secured to the bottom of the lampiramc, a small set-screw in the side of said tube, and a bottom screw-cap for said tube extending over said set screw, as set forth.

3. In an arc-lamp, the combination with a frame, of a solenoid-coil, carried by said frame, a tube of nonmagnetic material disposed within. said coil, strips of magnetic material disposed longitudinally of the coil between the inner surface of the coil and the said tube, a two-part carbon-clutch composed oi lougitudinally-disposed bars each carrying rings adapted to embrace a carbon, said clutch being, arranged within said tube In testimony whereof we have signed our l names to this specification in the presence of two subscribing witnesses.

JOHN H. BENNETT. ADRIAN l. MINER.

Witnesses: 7

PERCY S. WEBsTEn, Josnns B. VVEns'rnn. 

